System doesn't detect unplugged network cable and doesn't set interface up properly with DHCP

[Paul A. Procacci]

On Thu, Jul 12, 2012 at 03:25:07PM -0700, Chris Benesch wrote:
> Maybe another option to dhclient to have it poll the interface every 2-3
> seconds to see if it has lost a link and if so, set the lease timer to be
> expired, and wait for it to come back and once it does, it will acquire a
> new address.
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The Operating system should generate a devd event.

Something like the following in /usr/local/etc/devd.conf should do the trick,
though I haven't tested the below with anything other than carp interfaces.
I suspect it works just the same.

######################################################
notify 30 {
        match "system" "IFNET";
        match "subsystem" "em0_or_whatever";
        match "type" "LINK_UP";
        action "/usr/local/sbin/script_to_do_something.sh up";
};

notify 30 {
        match "system" "IFNET";
        match "subsystem" "em0_or_whatever";
        match "type" "LINK_DOWN";
        action "/usr/local/sbin/script_to_do_something.sh down";
};
######################################################

~Paul

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